Jacob seabtjry



' unirsi) sTArEs PATENT onirica.

JACOB SEABURY, OF NEW YORK, Y.,VASSIGNOR TO DANIEL GRIFFIN, OF NEWYORK,-1 \l. Y.

BoILER-FURNACE.

Speccationrof Letters Patent No. 5,213, dated July 31, 1847. l

To all/whom t may concern Be it known that I, JACOB SEABURY, of the cityof New York7 in the State of New York.l have invented a new and usefulImprovement in the Manner of Setting Boilers of Steam-Engines and ofDetaining the Heat in "Furnaces Constructed 4for the Generating of Steamand for other Purposes; and I do hereby declare that the following is afull and exact description thereof.

' My method of setting the boilers of steam engines, and of detainingthe heat in furnaces for that and'other purposes, is an improvement-'onthe apparatus described in the specification of Letters VIatent for animprovement'in the manner of constructing the iiues of furnaces ofvarious descriptions granted to Jeremiah Clute, and to the subscriber,Jacob Seabury, under date of the 5th of December in the year 1842.

In the accompanying drawing I have given a perspective representation ofa steam boiler set in my improved manner; the wall on one side thereofbeing removed for the purpose of exhibiting the arrangement of theinterior.

B is the boiler, which is represented as of the ordinary cylindricalkind; but this form is not necessary to my improved mode of setting,which is independent altogether of the particular shape of the boiler.

F is the fire chamber, and C the ash-pit; both of which are to beprovided with closely fitting doors, as the air necessary to combustionis to be supplied by means of a blowing apparatus of any suitable kind.

G represents a fan wheel which may be vused for this purpose. H, H, areair tubes leading from the blow-v ing apparatus, and opening into theash pit, as shown at H. The air tubes H, are shown as passing throughthe heated air space A, which, although not absolutely necessary, is tobe preferred. The air space A, I make of considerable capacity, asrepresented, as it is intended to hold and retain a large portion of theair that has been heated, or generated in the lire chamber F, and whichhas passed thence over the bridge E into said space.

J is the chimney stack, in which I is the ascending flue, andthe air inpassing from the chamber A into the ascending flue I, hasI first to passdown through the descending flue L and along the flue space K.

O is an opening leading vdirectly from the chamber A into the ascendingflue L, this Yopening being furnished with a sliding shutter N by meansof which it may be closedat pleasure. The intention of this openingk isto facilitate the firing up by allowi'nga direct draft. into theascending iuebut this opening is to be closed when the fire-is in fullaction; it may however be dispensed with, Vas' not being absolutelynecessary in using the apparatus. l

I have mentioned the heated air space Al as 4of considerable capacity,and it is represented as extending to an unusual depth below the boilerand this is necessary to the full application of the principle uponwhich the action of the furnace is dependent, it being intended toconiinea large volume of heatedV air under pressure in that space. Thisspace may, as I believe, be vincreased considerably beyondk thatrepresented in the drawingby carryingthe bottom of it lower` down; whichwill have the effect of shorten! ving the descending flue (L); but thesaid flue may also be made to pass down to an increased depth should itbe desired.` The opening shown at (D) in the ascending flue (I) ishowever the main improvement made in the present apparatus,` whencompared with that for which Letters Patent were granted to Clute andSeabury and hereinbefore referred to. By means of this improvement I amenabled to counteract all tendency to an upward draft in Said flue; theopening being left so as to admit the full action of the external airexcepting4 when in the act of firing up, at which time the door (M) isto be closed, but at other times it -is ao j to be left entirely open. Acolumn of the cold and dense external air will thus be made to pressupon the heated internal air and will contribute to a great extent inpreventing its free discharge.

I am aware that the iiues of stoves and chimneys have been made withapertures in them for the admission of cold air at some point beyond thelire place; in chimneys this has been done under the erroneoussupposition that the draft would thereby'V be increased, or the smokingof the chimney be prevented; and in cooking stoves for the purpose ofcooling the oven when some part of the culinary operation requires ahigh degree of heat, and the oven or some part thereof requires but amoderate degree of,

combined means employed are also different.`

As for instance, my object is to check the draft at some point entirelybeyond the boiler Hues, or beyond the parts of the apparatus which areto be heated, Aand to'retain the products of combustion within the Hues&c., under pressure that the Hame produced by the combustion in the firechamber and by the combustion of the combustible gases in the Hues mayhave full play and not escape until the full amount of caloric due to afull combustion shall have been given out. To this end therefore I havelaced the aperture which opens the ascending Hue to the external air'ata point, entirely beyond the parts of the, apparatus which are to beheated and beyond the diving or descending Hue so that the pressure ofthe external air shall resist the u ward tendency of the heated productso combustion before they shall have risen to so great an elevation as togive the preponderance of pressure to the upward current, an end whichcould not have been attained without the diving or descending Hue, forwithout this the products of combustion could not be retained in the Hueor Hame space under pressure.

It will be obvious that instead of a vertical diving Hue the heatingchamber may be carried down to the lower end of the ascending flue asthe object is to have the ascending ment in the manner of setting theboilers of,V steam engines, and of detaining Vthe heated air in furnacesfor generating steam, and for other purposes, what I claim therein asnew, and desire to secure by Letters Patent, is-

The forming of an opening or openings Y near to the lower part of theascending Hue I, in the chimney stack, as shown at D, in theaccompanying drawings, in combination with the descending Hue,substantially as described, to check the draft up the chimney,

and thereby to detain thel heated gases unn der pressure within afurnace, in the manner set forth.

JACOB SEABURY.

Witnesses:

RICHARD E. DIBBLE, JOHN N. CRANE.

